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Update - SOLVED New Thread here about performance decaying rapidly from running perfectly to not running at all, over and over again. https://mazdaspeeds.org/index.php?threads/stumbling-rough-running-stalling-now-no-start.17548/ Culprit was a bad fuel pressure sensor. Sensor worked correctly...

UPDATE - Solved After days and days of an enigma of a Speed..... Start it in the morning, runs like a top, drive it 1/2 mile and it strands you with misfires, stalling and no starts, plugs covered in carbon. Sits for a few hours, might start and barely run, might start and run like a top...

30 miles NE of ATL NGK Iridiums from Orielly's 17.99 each x's 4 + tax ='s $77

Disassembled HPFP and cleaned. Relatively unremarkable. Black and dirty, little bit of caked on crust here and there. Plastic inlet filter was all but blocked with varnish, replaced with Corksport stainless screen. Reinstalled HPFP Attempted to start. Same result. Just a few putt putts...

OK. Will do. But HPFP was already replaced with known good one during this saga. There was was no change in performance. Also, does that instruction indicate that you do not suspect a relief valve failure?

Performance degraded rapidly from running perfectly, then stumbling, then barely running, then stalls, then starts but barely running, to barely starts, then to no start. Back story. 2012 Speed3 - all stock except for junky Corksport Cold air intake and Catback exhaust Car sat for 2 years...

Update. Went for test drive. 1st 5 miles was great, then began to stumble and stall. Now in a no start issue. I will start a new thread with relevant topic.

I was able to get to the connector for injector #1 without taking the intake manifold off. Noid light confirmed no signal to injectors. Looked harder at back tracing signal circuit. Blue injector relay was vacant from under hood fuse block and found in the cup holder. I knew that it was...

MAF unplugged. No dice. Just for giggles, in the am, I am going to swap in another ECU just to eliminate that variable.

Copy. Thank you. I will try unplugging the MAF and report back. Also, will try to get my hands on a Snap-On scan tool and see if it will let me manually trigger the injectors, or graph them during the brief 5-10 seconds that it runs.

Just replaced the head and now I have a no start situation. But car starts and runs on starter fluid. 2012 Speed3 - all stock except for junky Corksport Cold air intake Purchased car with a burned valve in cylinder 4, but engine ran. I drove it down the block and into my trailer. I just...